MooseX ::声明如何从属性默认方法返回ArrayRef?

时间:2012-01-12 11:52:31

标签: perl moose

我意识到这可能是我对perl或Moose某些部分的基本误解,但我似乎无法从default方法返回ArrayRef:

has '_directories' => (
    is => 'ro', 
    isa => 'ArrayRef[Str]', 
    lazy => 1, 
    init_arg => undef, 
    default => method {return File::Spec->splitdir($self->relativeDirectory)});

给出:

Attribute (_directories) does not pass the type constraint because: 
Validation failed for 'ArrayRef[Str]' with value 3

如何解决这个问题?

1 个答案:

答案 0 :(得分:6)

splitdir返回列表,而不是arrayref。您可以使用[]构造函数从列表构造arrayref:

default => method {return [ File::Spec->splitdir($self->relativeDirectory) ] },